Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials

Mandeep Singh, Sanjeev Kumar Raghuwanshi, T. Srinivas

Research output: Contribution to journalArticle

Abstract

A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge2Sb2Te5, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.

Original languageEnglish
Pages (from-to)3196-3199
Number of pages4
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume383
Issue number25
DOIs
Publication statusPublished - 02-09-2019

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phase change materials
electro-optics
modulators
chips
rings
extinction
C band
surface plasmon resonance
slots
finite element method
waveguides
modulation
radii
shift
thin films
wavelengths
excitation
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials",
abstract = "A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge2Sb2Te5, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.",
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Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials. / Singh, Mandeep; Raghuwanshi, Sanjeev Kumar; Srinivas, T.

In: Physics Letters, Section A: General, Atomic and Solid State Physics, Vol. 383, No. 25, 02.09.2019, p. 3196-3199.

Research output: Contribution to journalArticle

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